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INCOME TAXES - Summary of Net Operating Loss Carryforwards (Details) $ in Millions	Dec. 31, 2020 USD ($)
Operating Loss Carryforwards [Line Items]
Carryforward Amount	$ 419.8
Tax Benefit Amount	64.3
Valuation Allowance	(45.9)
Net Tax Benefit	18.4
United States federal net operating losses | United States | Carryforward Period Ends 2030-2037
Operating Loss Carryforwards [Line Items]
Carryforward Amount	26.6
Tax Benefit Amount	5.6
Valuation Allowance	0.0
Net Tax Benefit	5.6
United States federal net operating losses | United States | Carryforward Period Indefinite
Operating Loss Carryforwards [Line Items]
Carryforward Amount	11.3
Tax Benefit Amount	2.4
Valuation Allowance	0.0
Net Tax Benefit	2.4
United States federal net operating losses | United States | Carryforward Period Ends 2022
Capital Loss Carryforward [Abstract]
Carryforward Amount	34.1
Tax Benefit Amount	0.2
Valuation Allowance	(0.2)
Net Tax Benefit	0.0
United States state net operating losses | United States | Carryforward Period Indefinite
Operating Loss Carryforwards [Line Items]
Carryforward Amount	1.0
Tax Benefit Amount	0.1
Valuation Allowance	(0.1)
Net Tax Benefit	0.0
United States state net operating losses | United States | Carryforward Period Ends 2026-2039
Operating Loss Carryforwards [Line Items]
Carryforward Amount	33.5
Tax Benefit Amount	2.1
Valuation Allowance	(2.1)
Net Tax Benefit	0.0
Non-United States net operating losses | International | Carryforward Period Indefinite
Operating Loss Carryforwards [Line Items]
Carryforward Amount	295.1
Tax Benefit Amount	49.2
Valuation Allowance	(39.9)
Net Tax Benefit	9.3
Non-United States net operating losses | International | Carryforward Period Ends 2020-2027
Operating Loss Carryforwards [Line Items]
Carryforward Amount	18.2
Tax Benefit Amount	4.7
Valuation Allowance	(3.6)
Net Tax Benefit	$ 1.1

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